Match List - I with List - II.
| List - I | List - II |
| (A) Molecular solid | (I) CaF2 |
| (B) Ionic solid | (II) Cu |
| (C) Metallic solid | (III) CCl4 |
| (D) Covalent solid | (IV) SiC |
Choose the correct answer from the options given below :
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
The type of a crystalline solid is fixed by the particles it is built from and the force that holds them together:
(A) Molecular solid — This matches (III) CCl4. Solid \( \ce{CCl4} \) is made of discrete non-polar molecules held by weak dispersion forces.
(B) Ionic solid — This matches (I) CaF2. \( \ce{CaF2} \) consists of \( \ce{Ca^{2+}} \) and \( \ce{F^{-}} \) ions held by strong coulombic forces.
(C) Metallic solid — This matches (II) Cu. Copper is a lattice of positive ions in a sea of delocalised electrons (metallic bonding).
(D) Covalent solid — This matches (IV) SiC. In silicon carbide every Si and C atom is covalently bonded to its neighbours throughout the crystal, giving a giant network.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Different Types of Solids (rows of Table 1.2)
| Type of Solid | Constituent Particles | Bonding/Attractive Forces | Examples |
|---|---|---|---|
| (1) Molecular solids: (i) Non polar | Molecules | Dispersion or London forces | Ar, CCl4, H2, I2, CO2 |
| (2) Ionic solids | Ions | Coulombic or electrostatic | NaCl, MgO, ZnS, CaF2 |
| (3) Metallic solids | Positive ions in a sea of delocalised electrons | Metallic bonding | Fe, Cu, Ag, Mg |
| (4) Covalent or network solids | Atoms | Covalent bonding | SiO2 (quartz), SiC, C (diamond), AlN, C (graphite) |